1 results about "Device Usage" patented technology

Verifying that a user is using a device at a pre-designated location between a start time and an end time includes: computing a challenge and an answer as a function of the challenge; generating and storing in a blockchain a commitment including an identity of the user, an identity of the device, the pre-designated location associated with the user, a start time of the device usage, an end time of the device usage, and the computed challenge; generating a visual code for the device to carry the answer; encrypting the generated visual code using a public key of the device, wherein the encrypted visual code can only be decrypted with a private key of the device; and storing the encrypted visual code in the blockchain.